No message left so probably spam scam

Caller: A male

I didn’t say anything but the guy said “hello?” After I said “hello?”the call was disconnected. Probably, the caller is checking your phone number is active or not.

Caller: Unknown

Called. No message left. Suspcious.

this number called did not leave a message & phone came up with SPAM so thought I'd try here...will block in 24hrs if no return call

Call doesn't ring and no message left.